import type { MaskOptions } from '../../utils/types';
/**
 * Standard signature for all masker functions (supports sync and async).
 */
export type MaskerFn = (value: string, options: MaskOptions) => Promise<string> | string;
/**
 * Injectable registry for masker functions.
 */
export declare class MaskerRegistry {
    private maskers;
    /**
     * Register a masker function for a specific type.
     */
    register(type: string, masker: MaskerFn): this;
    /**
     * Retrieve a masker by type.
     */
    get(type: string): MaskerFn | undefined;
    /**
     * Check if a masker exists for the given type.
     */
    has(type: string): boolean;
    /**
     * Remove a registered masker (useful for testing).
     */
    unregister(type: string): boolean;
    /**
     * Get all registered type names.
     */
    types(): string[];
    /**
     * Create a new isolated registry instance.
     */
    static create(): MaskerRegistry;
}
/**
 * Default process-wide registry populated by `registerDefaults()` at module
 * load.
 */
export declare const defaultRegistry: MaskerRegistry;
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